|No.|Train No:|Origin|Destination|Train Name|
|---|---|---|---|---|
|1.|56654|Mangalore Central|Kozhikode|Passenger|
|2.|56324|Mangalore Central|Coimbatore city Junction|Fast Passenger|
|3.|56656|Mangalore Central|Kannur|Passenger|
|4.|56643/56645|Mangalore Central|Kabakaputtur|Passenger|
|5.|56640|Mangalore Central|Verna|Passenger|
|6.|56647|Mangalore Central|Subrahmanya Road|Passenger|
|7.|56661|Mangalore Central|Cheruvathur|Passenger|
|8.|70106|Mangalore Central|Bhatkal|DEMU|

Question: how many trains are demu category?
Answer: 1